DALLAS — One day last May, Ladar Levison returned home to find an F.B.I. agent’s business card on his Dallas doorstep. So began a four-month tangle with law enforcement officials that would end with Mr. Levison’s shutting the business he had spent a decade building and becoming an unlikely hero of privacy advocates in their escalating battle with the government over Internet security.

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“It was the equivalent of asking Coca-Cola to hand over its secret formula,” Mr. Levison said.

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“This wasn’t about one person,” Mr. Levison said. “This was about the lengths our government was willing to go to conduct Internet surveillance on one person.”

The best way to learn UNIX is to play with it, and the harder you play, the more you learn. If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD

WASHINGTON — The F.B.I. secretly arrested a National Security Agency contractor in recent weeks and is investigating whether he stole and disclosed highly classified computer code developed to hack into the networks of foreign governments, according to several senior law enforcement and intelligence officials.

The best way to learn UNIX is to play with it, and the harder you play, the more you learn. If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD